CT1420F / WALTHAM [TV]

• Uncontrollable HT. (+ extract of circuit diagram)
• Switches off by itself. intermittently. (CT1420F tips)
• Adjusting the G2.
• Reduced width. Ragged verticals.
• Dead.
• Insufficient height and wavy vertical elements (or sawtooth peaks) in picture.
• Vertical collapse.
• Vertical line on LHS of screen about 3 inches in from the side. (CT1420F tips)
• Excessive brightness. Flyback lines.
• White line in the middle of screen. Sound OK.
• Picture appears late with blotches. Low horizontal size.
• Vertical collapse. after a few minutes.
• Permanent display on Screen. Full volume and brightness. (service info for WALTHAM -CT1420F)
• Sound volume increases to maximum spontaneously.
• Power supply.
• No e.h.t. and no tube heater supply.
• No picture, no sound. When unplugging and plugging back in to mains, it turns on immediately. (picture attached)
• No voltage.
• Colour adjustment (black).
• Multicomponent failure. TR801 S/C and R801 O/C. (extract of circuit diagram attached)
• No functions.
• Switches to standby. intermittently.
• Picture reception, no sound, general commands do not function.
• Low level mono sound, NICAM OK.
• No picture. No sound. Red LED lights. No start-up with RC.
• No TXT. (CT1420F WALTHAM repair tip)
• Picture too small.
• Video demodulator AFC adjustment.
• No energy transfer to secondary side of PSU. (picture attached)
• F801 blown.
• Dark picture.
• No 12V supply.
• Picture has collapsed at the side, lines ragged in part.
• Adjusting the horizontal oscillator.
• Adjusting the audio trap.
• No raster after power supply fault (Z 12V).
• Blue background. (CT1420F WALTHAM repair tip)
• No picture. Dark screen. Sound OK.
• No or low energy output. Transformer squealing and TR801 hot. (+ extract of circuit diagram)
• Vertical fault. Patterns in picture. Noise in picture.
• Does not switch to standby. (service info for WALTHAM -CT1420F)
• Insufficient width and corrugated verticals.
• Intermittent faults ranging from text problems to going dead.
• Bright white with flyback lines. (extract of circuit diagram attached)
• Picture only approx 2cm high. No reception
• Intermittently no picture and one colour.
• Insufficient width and wavy vertical elements in picture.
• Red fuse blown.
• Dead, brief rustle of EHT.
• Low vertical deflection (picture only approx. 3cm high).
• No picture. via SCART. Audio OK .
• Starts up with the RCU, dark screen with two lines at the top. No function with the RCU, does not go off. (extract of circuit diagram attached)
• No sound, no picture. When pushing the G2 a 5cm high white line appears. (extract of circuit diagram attached)
• Tripping.
• No picture. No audio.
• Picture flashes for a few seconds at channel switch-over.
• One channel missing, probably NICAM. (WALTHAM - CT1420F information)
• Mono audio, red OSD, no switching to stereo with RC also noisy PLL line. (part of circuit diagram displayed)
• Adjusting the white BRP.
• Vertical foldover at top.
• NICAM module.
• Slow start-up.
• Dark picture. Audio OK . (CT1420F tip from WALTHAM)
• Narrow dull picture and line tearing with cogging effect.
• Horizontal buzz in the picture.
• No picture in AV.
• No line drive.
• No OSD.
• Black screen with 2 colured lines visible at the top of the screen. (+ extract of circuit diagram)
• Snow. No channels.
• Vertical approx 1in short top and bottom. Insufficient vertical size control. (WALTHAM - CT1420F information)
• Picture has collapsed at the sides and lines are frayed.
• Various intermittent functions.
• Raster is blank, red LED does not light up at switch on.
• Horizontal jitter. Squealing from PSU.
• Adjusting the FM demodulator.
• Distorted picture via HF, via scart perfect picture and sound.
• Audio stages.
• Green picture. (service info for WALTHAM -CT1420F)
• Severe picture curling (coding effect).
• No manual operation.
• Takes a long time to come on and when it does the picture rolls or teletext characters appear at random.
• Nasal sound. LF ok. (with circuit diagram extract)
• Adjusting the geometry and focus. (service info for WALTHAM -CT1420F)
• Squealing from PSU.
• Bright raster. Flyback lines.
• Reduced vertical deflection.
• Switches off when any button is pressed.
• Colour decoder, chroma path.
• No raster.
• Blank raster. intermittently.
• Screen width is 10cm short on each side.
• When changing channels, pumping or flickering of the picture for 2 or 3 seconds according to the strength of the HF signal. (+ extract of circuit diagram)
• Vertical deflection has failed. Line width approx 1 cm.
• No HV.
• 3cm wide line in the middle, sound and picture present
• No EHV.
• Stuck in standby.
• No picture. (CT1420F tip from WALTHAM)
• Difficult start up; narrow frame; power supply is low.
• Trips at 1HZ, chirping sound.
• Switches to mono on some picture scenes or channel changes. (extract of circuit diagram attached)
• Bright picture. Flyback lines.
• Muted audio. (extract of circuit diagram attached) (CT1420F tips)
• Blank screen. after a while.
• 2 cm wide horizontal stripe.
• Reduced vertical size.
• No brightness control.
• Image has green glimmer and overdrive. (extract of circuit diagram attached)
• Line tearing. Reduced horizontal size. (CT1420F tips)
• No picture. If adjusting brightness control, screen display reacts correctly, but picture brightness does not increase at all.
• At switch on black band 10 cm from the top of the screen disappearing little by little or when reducing the brightness. (+ extract of circuit diagram) (CT1420F tips)
• Excessive line pulling and tearing or bent verticals with lack of width.
• ACG adjustment.
• Brightness control not working though the on-screen display says that it is.
• Reduced horizontal size. Torn picture.
• No picture and no sound. OK with RC.
• After approx 5 mins picture disappears occasionally then reappears. Then appliance can no longer be operated by the RCU. After switching on and off, the fault repeats once more.
• No start-up. (with circuit diagram extract)
• Adjusting U1 (stabilised).
• What is the power supply voltage adjustable with VR801 and the test point ?
• No functions from RC. Black screen. Starts up correctly from standby using RC.
• Adjusting the colour.
• R801 (2R2/5W) O/C and TR801 (BU508A) S/C.
• No line drive. Audio OK .
• No channel change and no sound. Standby function does not respond.
• Dark screen. (WALTHAM - CT1420F information)
• No EHT or heater. (CT1420F tip from WALTHAM)
• Stuck in standby (intermittently).
• Loss of channel memory after a few days.
• No vertical deflection. Black screen.